摘要
实验以梯度冷却尿素包合法,将废弃油脂生物柴油分成包合脂肪酸甲酯与非包合脂肪酸甲酯两种产品。考察了降温速率、冷却搅拌速度、尿素/甲酯比、溶剂/甲酯比,及最终冷却温度等因素对分离效果的影响。实验结果表明,梯度冷却尿素包合的适宜条件为:降温速率1.0℃/min,搅拌速率300r/min,m(尿素)∶m(甲酯)=1.3∶1,m(溶剂)∶m(甲酯)=5∶1,最终冷却温度10℃。在此条件下,非包合脂肪酸甲酯收率为83.8%,其不饱和脂肪酸甲酯质量分数为94.8%,冷却结晶时间比传统工艺极大缩短,仅需1h左右。
Two products fatty acid methyl esters（FAME） of non-urea complexes and FAME of urea complexes were prepared from waste oils biodiesel by gradient cooling urea inclusion. Effects of cooling rate, stirring rate, urea-to-biodiesel ratio, solvent-to-biodiesel ratio, final cooling temperature and the cooling time at final temperature were investigated. The optimum conditions were found as fol- lows： cooling rate 1.0 ~C/min, the stirrer rate of increment 300 r/min, urea-to-biodiesel ratio 1.3 ： 1, solvent-to-biodiesel ratio 5 ： 1, final cooling temperature 10℃. Under the optimum conditions, the FAME yield of non-urea complexes was 83.8%, and its unsaturated FAME content was 94.8%. The cooling crystallization time was only more than 1 h, much shorter than that of the conventional direct cooling method.
出处
《精细石油化工》
CAS
CSCD
北大核心
2011年第5期23-28,共6页
Speciality Petrochemicals
关键词
梯度冷却
尿素包合
脂肪酸甲酯
废弃油脂
生物柴油
gradient cooling
urea inclusion
fatty acid methyl esters
waste oils
biodiesel
